feat (math): binary un-/marshal format for the GDA dec type.

[alpe]

Description

implements a binary un-/marshal format for the GDA dec type.

based on dev branch
Alternative formats:

• binary
• hybrid
• scientific

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[mergify]

⚠️ The sha of the head commit of this PR conflicts with #22332. Mergify cannot evaluate rules on this PR. ⚠️

[alpe]

Closing this in favour of #22529